net: fix proxy protocol

pkg/proxy/net/packetio.go

@@ -103,12 +103,15 @@ func NewPacketIO(conn net.Conn, opts ...PacketIOption) *PacketIO {
 		sequence: 0,
 		buf:      buf,
 	}
-	// TODO: disable it by default now
 	p.proxyInited.Store(true)
+	p.ApplyOpts(opts...)
+	return p
+}
+
+func (p *PacketIO) ApplyOpts(opts ...PacketIOption) {
 	for _, opt := range opts {
 		opt(p)
 	}
-	return p
 }
 
 func (p *PacketIO) wrapErr(err error) error {
@@ -117,10 +120,7 @@ func (p *PacketIO) wrapErr(err error) error {
 
 // Proxy returned parsed proxy header from clients if any.
 func (p *PacketIO) Proxy() *proxyprotocol.Proxy {
-	if p.proxyInited.Load() {
-		return p.proxy
-	}
-	return nil
+	return p.proxy
 }
 
 func (p *PacketIO) LocalAddr() net.Addr {

pkg/proxy/net/packetio_options.go

@@ -23,7 +23,7 @@ import (
 type PacketIOption = func(*PacketIO)
 
 func WithProxy(pi *PacketIO) {
-	pi.proxyInited.Store(true)
+	pi.proxyInited.Store(false)
 }
 
 func WithWrapError(err error) func(pi *PacketIO) {

pkg/proxy/net/packetio_test.go

@@ -22,62 +22,33 @@ import (
 
 	"github.com/pingcap/TiProxy/lib/config"
 	"github.com/pingcap/TiProxy/lib/util/security"
-	"github.com/pingcap/TiProxy/lib/util/waitgroup"
+	"github.com/pingcap/TiProxy/pkg/testkit"
 	"github.com/pingcap/tidb/parser/mysql"
 	"github.com/stretchr/testify/require"
 )
 
 func testPipeConn(t *testing.T, a func(*testing.T, *PacketIO), b func(*testing.T, *PacketIO), loop int) {
-	var wg waitgroup.WaitGroup
-	client, server := net.Pipe()
-	cli, srv := NewPacketIO(client), NewPacketIO(server)
-	if ddl, ok := t.Deadline(); ok {
-		require.NoError(t, client.SetDeadline(ddl))
-		require.NoError(t, server.SetDeadline(ddl))
-	}
-	for i := 0; i < loop; i++ {
-		wg.Run(func() {
+	testkit.TestPipeConn(t,
+		func(t *testing.T, c net.Conn) {
+			a(t, NewPacketIO(c))
+		},
+		func(t *testing.T, c net.Conn) {
+			b(t, NewPacketIO(c))
+		}, loop)
+}
+
+func testTCPConn(t *testing.T, a func(*testing.T, *PacketIO), b func(*testing.T, *PacketIO), loop int) {
+	testkit.TestTCPConn(t,
+		func(t *testing.T, c net.Conn) {
+			cli := NewPacketIO(c)
 			a(t, cli)
 			require.NoError(t, cli.Close())
-		})
-		wg.Run(func() {
+		},
+		func(t *testing.T, c net.Conn) {
+			srv := NewPacketIO(c)
 			b(t, srv)
 			require.NoError(t, srv.Close())
-		})
-		wg.Wait()
-	}
-}
-
-func testTCPConn(t *testing.T, a func(*testing.T, *PacketIO), b func(*testing.T, *PacketIO), loop int) {
-	listener, err := net.Listen("tcp", "0.0.0.0:0")
-	require.NoError(t, err)
-	defer func() {
-		require.NoError(t, listener.Close())
-	}()
-	var wg waitgroup.WaitGroup
-	for i := 0; i < loop; i++ {
-		wg.Run(func() {
-			cli, err := net.Dial("tcp", listener.Addr().String())
-			require.NoError(t, err)
-			if ddl, ok := t.Deadline(); ok {
-				require.NoError(t, cli.SetDeadline(ddl))
-			}
-			cliIO := NewPacketIO(cli)
-			a(t, cliIO)
-			require.NoError(t, cliIO.Close())
-		})
-		wg.Run(func() {
-			srv, err := listener.Accept()
-			require.NoError(t, err)
-			if ddl, ok := t.Deadline(); ok {
-				require.NoError(t, srv.SetDeadline(ddl))
-			}
-			srvIO := NewPacketIO(srv)
-			b(t, srvIO)
-			require.NoError(t, srvIO.Close())
-		})
-		wg.Wait()
-	}
+		}, loop)
 }
 
 func TestPacketIO(t *testing.T) {

pkg/proxy/net/proxy_test.go

@@ -0,0 +1,65 @@
+// Copyright 2023 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package net
+
+import (
+	"bytes"
+	"io"
+	"net"
+	"testing"
+
+	"github.com/pingcap/TiProxy/pkg/proxy/proxyprotocol"
+	"github.com/stretchr/testify/require"
+)
+
+func TestProxyParse(t *testing.T) {
+	tcpaddr, err := net.ResolveTCPAddr("tcp", "192.168.1.1:34")
+	require.NoError(t, err)
+
+	testPipeConn(t,
+		func(t *testing.T, cli *PacketIO) {
+			p := &proxyprotocol.Proxy{
+				Version:    proxyprotocol.ProxyVersion2,
+				Command:    proxyprotocol.ProxyCommandLocal,
+				SrcAddress: tcpaddr,
+				DstAddress: tcpaddr,
+				TLV: []proxyprotocol.ProxyTlv{
+					{
+						Typ:     proxyprotocol.ProxyTlvALPN,
+						Content: nil,
+					},
+					{
+						Typ:     proxyprotocol.ProxyTlvUniqueID,
+						Content: []byte("test"),
+					},
+				},
+			}
+			b, err := p.ToBytes()
+			require.NoError(t, err)
+			_, err = io.Copy(cli.conn, bytes.NewReader(b))
+			require.NoError(t, err)
+			err = cli.WritePacket([]byte("hello"), true)
+			require.NoError(t, err)
+		},
+		func(t *testing.T, srv *PacketIO) {
+			srv.ApplyOpts(WithProxy)
+			b, err := srv.ReadPacket()
+			require.NoError(t, err)
+			require.Equal(t, "hello", string(b))
+			require.Equal(t, tcpaddr.String(), srv.RemoteAddr().String())
+		},
+		1,
+	)
+}

pkg/proxy/proxyprotocol/definition.go

@@ -63,8 +63,8 @@ const (
 )
 
 type ProxyTlv struct {
-	content []byte
-	typ     ProxyTlvType
+	Content []byte
+	Typ     ProxyTlvType
 }
 
 type Proxy struct {

pkg/proxy/proxyprotocol/listener_test.go

@@ -43,12 +43,12 @@ func TestProxyListener(t *testing.T) {
 				DstAddress: tcpaddr,
 				TLV: []ProxyTlv{
 					{
-						typ:     ProxyTlvALPN,
-						content: nil,
+						Typ:     ProxyTlvALPN,
+						Content: nil,
 					},
 					{
-						typ:     ProxyTlvUniqueID,
-						content: []byte("test"),
+						Typ:     ProxyTlvUniqueID,
+						Content: []byte("test"),
 					},
 				},
 			}

pkg/proxy/proxyprotocol/proxy.go

@@ -92,10 +92,10 @@ func (p *Proxy) ToBytes() ([]byte, error) {
 	buf[magicLen+1] = byte(addressFamily<<4) | byte(network&0xF)
 
 	for _, tlv := range p.TLV {
-		buf = append(buf, byte(tlv.typ))
-		tlen := len(tlv.content)
+		buf = append(buf, byte(tlv.Typ))
+		tlen := len(tlv.Content)
 		buf = append(buf, byte(tlen>>8), byte(tlen))
-		buf = append(buf, tlv.content...)
+		buf = append(buf, tlv.Content...)
 	}
 
 	length := len(buf) - 4 - magicLen
@@ -205,8 +205,8 @@ func ParseProxyV2(rd io.Reader) (m *Proxy, n int, err error) {
 			length = len(buf) - 3
 		}
 		m.TLV = append(m.TLV, ProxyTlv{
-			typ:     typ,
-			content: buf[3 : 3+length],
+			Typ:     typ,
+			Content: buf[3 : 3+length],
 		})
 		buf = buf[3+length:]
 	}

pkg/proxy/proxyprotocol/proxy_test.go

@@ -37,12 +37,12 @@ func TestProxyParse(t *testing.T) {
 				DstAddress: tcpaddr,
 				TLV: []ProxyTlv{
 					{
-						typ:     ProxyTlvALPN,
-						content: nil,
+						Typ:     ProxyTlvALPN,
+						Content: nil,
 					},
 					{
-						typ:     ProxyTlvUniqueID,
-						content: []byte("test"),
+						Typ:     ProxyTlvUniqueID,
+						Content: []byte("test"),
 					},
 				},
 			}
@@ -66,9 +66,9 @@ func TestProxyParse(t *testing.T) {
 			require.Equal(t, ProxyVersion2, p.Version)
 			require.Equal(t, ProxyCommandLocal, p.Command)
 			require.Len(t, p.TLV, 2)
-			require.Equal(t, ProxyTlvALPN, p.TLV[0].typ)
-			require.Equal(t, ProxyTlvUniqueID, p.TLV[1].typ)
-			require.Equal(t, []byte("test"), p.TLV[1].content)
+			require.Equal(t, ProxyTlvALPN, p.TLV[0].Typ)
+			require.Equal(t, ProxyTlvUniqueID, p.TLV[1].Typ)
+			require.Equal(t, []byte("test"), p.TLV[1].Content)
 		},
 		1,
 	)

pkg/testkit/main.go

@@ -64,7 +64,9 @@ func TestTCPConnWithListener(t *testing.T, listen func(*testing.T, string, strin
 				require.NoError(t, cli.SetDeadline(ddl))
 			}
 			a(t, cli)
-			require.NoError(t, cli.Close())
+			if err := cli.Close(); err != nil {
+				require.ErrorIs(t, err, net.ErrClosed)
+			}
 		})
 		wg.Run(func() {
 			srv, err := listener.Accept()
@@ -73,7 +75,9 @@ func TestTCPConnWithListener(t *testing.T, listen func(*testing.T, string, strin
 				require.NoError(t, srv.SetDeadline(ddl))
 			}
 			b(t, srv)
-			require.NoError(t, srv.Close())
+			if err := srv.Close(); err != nil {
+				require.ErrorIs(t, err, net.ErrClosed)
+			}
 		})
 		wg.Wait()
 	}